Another scary twist in the disappearance of "TODAY" host Savannah Guthrie's kidnapped mother ... TMZ has received an alleged ransom note demanding payment for the release of Nancy Guthrie. The note, which was sent to us Tuesday morning, demands a specific substantial amount of Bitcoin ... the amount is in the millions, and the note demands the cryptocurrency be sent to a specific Bitcoin address. TMZ has verified the Bitcoin address is real. There is a deadline connected to the alleged ransom ... and an element of "or else." In the moment on our live stream above, Harvey and Charles said she was wearing an item ... (full story)